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[195.135.220.15]) by mx.google.com with ESMTPS id c62si9332727edd.451.2019.05.22.08.52.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 May 2019 08:52:22 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 77824AEE2; Wed, 22 May 2019 15:52:21 +0000 (UTC) Date: Wed, 22 May 2019 17:52:20 +0200 From: Michal Hocko To: Konstantin Khlebnikov Cc: linux-mm@kvack.org, Andrew Morton , linux-kernel@vger.kernel.org, Roman Gushchin , Vlastimil Babka , Johannes Weiner Subject: Re: [PATCH] proc/meminfo: add MemKernel counter Message-ID: <20190522155220.GB4374@dhcp22.suse.cz> References: <155853600919.381.8172097084053782598.stgit@buzz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <155853600919.381.8172097084053782598.stgit@buzz> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed 22-05-19 17:40:09, Konstantin Khlebnikov wrote: > Some kinds of kernel allocations are not accounted or not show in meminfo. > For example vmalloc allocations are tracked but overall size is not shown > for performance reasons. There is no information about network buffers. > > In most cases detailed statistics is not required. At first place we need > information about overall kernel memory usage regardless of its structure. > > This patch estimates kernel memory usage by subtracting known sizes of > free, anonymous, hugetlb and caches from total memory size: MemKernel = > MemTotal - MemFree - Buffers - Cached - SwapCached - AnonPages - Hugetlb. Why do we need to export something that can be calculated in the userspace trivially? Also is this really something the number really meaningful? Say you have a driver that exports memory to the userspace via mmap but that memory is not accounted. Is this really a kernel memory? -- Michal Hocko SUSE Labs